Combination lock



FIG. 1 is a perspective view of a combination lock showing my new design;

FIG. 2 is a front view thereof;

FIG. 3 is a rear view thereof;

FIG. 4 is a left view thereof;

FIG. 5 is a right view thereof;

FIG. 6 is a top view thereof;

FIG. 7 is a bottom view thereof; and,

FIG. 8 is a perspective view thereof showing an opening state of the design. 

The ornamental design for a combination lock, as shown. 